513 lines
13 KiB
C
513 lines
13 KiB
C
#if !defined(lint) && !defined(SABER)
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static char sccsid[] = "@(#)ns_init.c 4.38 (Berkeley) 3/21/91";
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static char rcsid[] = "$Id: ns_init.c,v 8.40 1998/04/07 18:11:58 halley Exp $";
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#endif /* not lint */
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/*
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* Copyright (c) 1986, 1990
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Portions Copyright (c) 1993 by Digital Equipment Corporation.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies, and that
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* the name of Digital Equipment Corporation not be used in advertising or
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* publicity pertaining to distribution of the document or software without
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* specific, written prior permission.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
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* WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
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* CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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*/
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/*
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* Portions Copyright (c) 1996, 1997 by Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
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* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
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* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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*/
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#include "port_before.h"
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <netinet/in.h>
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#include <arpa/nameser.h>
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#include <arpa/inet.h>
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#include <ctype.h>
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#include <errno.h>
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#include <resolv.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <time.h>
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#include <isc/eventlib.h>
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#include <isc/logging.h>
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#include <isc/memcluster.h>
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#include "port_after.h"
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#include "named.h"
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#ifdef DEBUG
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static void content_zone(int, int);
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#endif
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/*
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* Set new refresh time for zone. Use a random number in the last half of
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* the refresh limit; we want it to be substantially correct while still
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* preventing slave synchronization.
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*/
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void
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ns_refreshtime(struct zoneinfo *zp, time_t timebase) {
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u_long refresh = (zp->z_refresh > 0) ? zp->z_refresh : INIT_REFRESH;
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time_t half = (refresh + 1) / 2;
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zp->z_time = timebase + half + (rand() % half);
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}
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/*
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* Set new retry time for zone.
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*/
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void
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ns_retrytime(struct zoneinfo *zp, time_t timebase) {
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zp->z_time = timebase + zp->z_retry;
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}
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/*
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* Read configuration file and save it as internal state.
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*/
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void
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ns_init(const char *conffile) {
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struct zoneinfo *zp;
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static int loads = 0; /* number of times loaded */
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ns_debug(ns_log_config, 1, "ns_init(%s)", conffile);
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gettime(&tt);
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if (loads == 0) {
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zones = (struct zoneinfo *)memget(64 * sizeof *zones);
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if (zones == NULL)
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ns_panic(ns_log_config, 0,
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"Not enough memory to allocate initial zones array");
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memset(zones, 0, 64 * sizeof *zones);
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nzones = 1; /* zone zero is cache data */
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/* allocate cache hash table, formerly the root hash table. */
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hashtab = savehash((struct hashbuf *)NULL);
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/* allocate root-hints/file-cache hash table */
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fcachetab = savehash((struct hashbuf *)NULL);
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/* init zone data */
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zones[0].z_type = Z_CACHE;
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zones[0].z_origin = savestr("", 1);
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init_configuration();
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} else {
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/* Mark previous zones as not yet found in boot file. */
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for (zp = &zones[1]; zp < &zones[nzones]; zp++)
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zp->z_flags &= ~Z_FOUND;
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}
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#ifdef DEBUG
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if (debug >= 3) {
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ns_debug(ns_log_config, 3, "content of zones before loading");
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content_zone(nzones - 1, 3);
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}
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#endif
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load_configuration(conffile);
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/* Erase all old zones that were not found. */
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for (zp = &zones[1]; zp < &zones[nzones]; zp++) {
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if (zp->z_type && (zp->z_flags & Z_FOUND) == 0) {
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#ifdef BIND_UPDATE
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/*
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* A dynamic zone might have changed, so we
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* need to dump it before removing it.
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*/
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if ((zp->z_flags & Z_DYNAMIC) &&
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((zp->z_flags & Z_NEED_SOAUPDATE) ||
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(zp->z_flags & Z_NEED_DUMP)))
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(void)zonedump(zp);
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#endif
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ns_stopxfrs(zp);
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do_reload(zp->z_origin, zp->z_type, zp->z_class);
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ns_notice(ns_log_config,
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"%s zone \"%s\" (%s) removed",
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zoneTypeString(zp), zp->z_origin,
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p_class(zp->z_class));
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free_zone_contents(zp, 1);
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memset(zp, 0, sizeof(*zp));
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}
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}
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#ifdef DEBUG
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if (debug >= 2) {
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ns_debug(ns_log_config, 2, "content of zones after loading");
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content_zone(nzones-1, 2);
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}
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#endif
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ns_debug(ns_log_config, 1, "exit ns_init()");
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loads++;
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}
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void
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zoneinit(struct zoneinfo *zp) {
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struct stat sb;
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int result;
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/*
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* Try to load zone from backup file,
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* if one was specified and it exists.
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* If not, or if the data are out of date,
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* we will refresh the zone from a primary
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* immediately.
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*/
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if (!zp->z_source)
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return;
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result = stat(zp->z_source, &sb);
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if (result != -1) {
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ns_stopxfrs(zp);
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purge_zone(zp->z_origin, hashtab, zp->z_class);
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}
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if (result == -1 || db_load(zp->z_source, zp->z_origin, zp, NULL)) {
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/*
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* Set zone to be refreshed immediately.
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*/
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zp->z_refresh = INIT_REFRESH;
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zp->z_retry = INIT_REFRESH;
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if (!(zp->z_flags & (Z_QSERIAL|Z_XFER_RUNNING))) {
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zp->z_time = tt.tv_sec;
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sched_zone_maint(zp);
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}
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} else {
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zp->z_flags |= Z_AUTH;
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zp->z_flags &= ~Z_NEED_RELOAD;
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ns_refreshtime(zp, tt.tv_sec);
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sched_zone_maint(zp);
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}
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}
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void
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do_reload(const char *domain, int type, int class) {
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struct zoneinfo *zp;
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ns_debug(ns_log_config, 1, "do_reload: %s %d %d",
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*domain ? domain : ".", type, class);
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/*
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* Check if the zone has changed type. If so, we might not need to
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* do any purging or parent reloading.
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*
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* If the new zone is a master zone, then it will have purged the
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* old data and loaded, so we don't need to do anything.
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*
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* If the new zone is a slave or stub zone and has successfully loaded,
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* then we don't need to do anything either.
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*
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* NOTE: we take care not to match ourselves.
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*/
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if ((type != z_master &&
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find_zone(domain, z_master, class) != NULL) ||
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(type != z_slave &&
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(zp = find_zone(domain, z_slave, class)) != NULL &&
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zp->z_serial != 0) ||
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(type != z_stub &&
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(zp = find_zone(domain, z_stub, class)) != NULL &&
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zp->z_serial != 0)
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)
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return;
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/*
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* Clean up any leftover data.
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*/
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purge_zone(domain, hashtab, class);
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/*
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* Reload
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*/
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while (*domain) {
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const char *s;
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int escaped;
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/*
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* XXX this is presentation level hair and belongs elsewhere.
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*/
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escaped = 0;
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for (s = domain; *s != '\0'; s++) {
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if (!escaped) {
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if (*s == '.')
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break;
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else if (*s == '\\')
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escaped = 1;
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} else
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escaped = 0;
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}
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if (*s != '\0')
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domain = s + 1; /* skip label and its separator */
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else
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domain = ""; /* root zone */
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if ((zp = find_zone(domain, Z_STUB, class)) ||
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(zp = find_zone(domain, Z_CACHE, class)) ||
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(zp = find_zone(domain, Z_PRIMARY, class)) ||
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(zp = find_zone(domain, Z_SECONDARY, class))) {
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ns_debug(ns_log_config, 1, "do_reload: matched %s",
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*domain ? domain : ".");
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if (zp->z_type == Z_CACHE)
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purge_zone(zp->z_origin, fcachetab,
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zp->z_class);
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else
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purge_zone(zp->z_origin, hashtab, zp->z_class);
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zp->z_flags &= ~Z_AUTH;
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switch (zp->z_type) {
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case Z_SECONDARY:
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case Z_STUB:
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zoneinit(zp);
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break;
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case Z_PRIMARY:
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if (db_load(zp->z_source, zp->z_origin, zp, 0)
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== 0)
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zp->z_flags |= Z_AUTH;
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break;
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case Z_CACHE:
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(void)db_load(zp->z_source, zp->z_origin, zp,
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0);
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break;
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}
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break;
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}
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}
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}
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#ifdef DEBUG
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/* prints out the content of zones */
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static void
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content_zone(int end, int level) {
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int i;
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for (i = 1; i <= end; i++) {
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printzoneinfo(i, ns_log_config, level);
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}
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}
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#endif
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enum context
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ns_ptrcontext(owner)
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const char *owner;
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{
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if (samedomain(owner, "in-addr.arpa") || samedomain(owner, "ip6.int"))
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return (hostname_ctx);
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return (domain_ctx);
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}
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enum context
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ns_ownercontext(type, transport)
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int type;
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enum transport transport;
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{
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enum context context = domain_ctx;
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switch (type) {
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case T_A:
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case T_WKS:
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case T_MX:
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switch (transport) {
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case primary_trans:
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case secondary_trans:
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context = owner_ctx;
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break;
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case response_trans:
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context = hostname_ctx;
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break;
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default:
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panic("impossible condition in ns_ownercontext()",
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NULL);
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}
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break;
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case T_MB:
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case T_MG:
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context = mailname_ctx;
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break;
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default:
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/* Nothing to do. */
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break;
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}
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return (context);
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}
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int
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ns_nameok(const char *name, int class, struct zoneinfo *zp,
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enum transport transport,
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enum context context,
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const char *owner,
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struct in_addr source)
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{
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enum severity severity = not_set;
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int ok = 1;
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if (zp != NULL)
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severity = zp->z_checknames;
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if (severity == not_set)
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severity = server_options->check_names[transport];
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if (severity == ignore)
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return (1);
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switch (context) {
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case domain_ctx:
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ok = (class != C_IN) || res_dnok(name);
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break;
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case owner_ctx:
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ok = (class != C_IN) || res_ownok(name);
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break;
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case mailname_ctx:
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ok = res_mailok(name);
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break;
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case hostname_ctx:
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ok = res_hnok(name);
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break;
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default:
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ns_panic(ns_log_default, 1,
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"unexpected context %d in ns_nameok", (int)context);
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}
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if (!ok) {
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char *s, *o;
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if (source.s_addr == INADDR_ANY)
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s = savestr(transport_strings[transport], 0);
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else {
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s = newstr(strlen(transport_strings[transport]) +
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sizeof " from [000.000.000.000]", 0);
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if (s)
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sprintf(s, "%s from [%s]",
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transport_strings[transport],
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inet_ntoa(source));
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}
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if (strcasecmp(owner, name) == 0)
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o = savestr("", 0);
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else {
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const char *t = (*owner == '\0') ? "." : owner;
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o = newstr(strlen(t) + sizeof " (owner \"\")", 0);
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if (o)
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sprintf(o, " (owner \"%s\")", t);
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}
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/*
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* We use log_write directly here to avoid duplicating
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* the message formatting and arguments.
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*/
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log_write(log_ctx, ns_log_default,
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(transport == response_trans) ?
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log_info : log_notice,
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"%s name \"%s\"%s %s (%s) is invalid - %s",
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context_strings[context],
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name, o != NULL ? o : "[memget failed]",
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p_class(class),
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s != NULL ? s : "[memget failed]",
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(severity == fail) ?
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"rejecting" : "proceeding anyway");
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if (severity == warn)
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ok = 1;
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if (s != NULL)
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freestr(s);
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if (o != NULL)
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freestr(o);
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}
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return (ok);
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}
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int
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ns_wildcard(const char *name) {
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if (*name != '*')
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return (0);
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return (*++name == '\0');
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}
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void
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ns_shutdown() {
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struct zoneinfo *zp;
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/* Erase zones. */
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for (zp = &zones[0]; zp < &zones[nzones]; zp++) {
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if (zp->z_type) {
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if (zp->z_type != z_hint) {
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ns_stopxfrs(zp);
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purge_zone(zp->z_origin, hashtab, zp->z_class);
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}
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free_zone_contents(zp, 1);
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}
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}
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memput(zones, ((nzones / 64) + 1) * 64 * sizeof *zones);
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/* Erase the cache. */
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clean_cache(hashtab, 1);
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hashtab->h_cnt = 0; /* ??? */
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rm_hash(hashtab);
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clean_cache(fcachetab, 1);
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fcachetab->h_cnt = 0; /* ??? */
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rm_hash(fcachetab);
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#ifdef BIND_NOTIFY
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db_cancel_pending_notifies();
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#endif
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freeComplaints();
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shutdown_configuration();
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}
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